reset chip fix generator samsung clp 325 printer

Reset Chip Fix Samsung Clp 325 Printer How To Cut The

Connecting the WP pin to V will write protect the entire array, regardless of whether or not the software write protection has been enabled.

First of all Samsung just released clp-310 (and its black version: the clp-315): for all the owners of the clp-300 unfortunately it means that they are planning to dismiss this printer, since the new toner cartridges for clp-315 and clp-310 are very different from the older ones for clp-300.

Now I will present herein a technique that permits to turn the vast majority of aftermarkets (non OEM chips) into permanent reset chips; this means that you can turn a single chip into one that will last forever, since it will never expire.

Common reset chips are cheap (4-7 dollars each), but they should be replaced as soon as the toner inside the cartridge finishes.

The total refill cost is quite expensive, because you have to add to the toner powder (6 per recharge) the reset chip (7).

Reset Chip Fix Samsung Clp 325 Printer How To Cut The

Lets see how to cut the costs related to the chips with a permanent reset chip.

To accomplish this task, you will need: I2C eeprom programmer; I will not describe how to build one on your own.

Please refer to the very detailed schemes here: Chiprecharge Serial Programmer Ponyprog software or similar one Two aftermarket chips (aftermarket reset chips based on at34c02 ) Basic soldering skills The Lock Protection Samsung clp-300 (the printer) track of the total number of the pages printed (referred as PAGES), it remembers other things as well, like the number of the print jobs (referred as JOBS) performed so far and the serial number of the toner cartridge (referred as CRUM number).

Each cartridge has a chip on it, which is basically a serial eeprom.

This eeprom is costantly written by the printer during all its lifetime span, and its permanently locked when it expires.

I have used the term expire because locked cartridges are not necessarily empty.

The printer has an internal counter which is associated to the last read CRUM number.

The internal counter starts with a number of 0 and ends at 2000 for the black cartridge, or at 1000 for the other colors.

The counter is increased by 1 for every printed page; when the counter reaches i.e.

When a new toner is inserted in the printer, the printer performs the following operations: For the very first 1000 pages the chip is not required (toner sold with the printer have no chip) The printer checks if the new CRUM on the chip is different from the previous one stored internally (date is NOT checked, just the CRUM) If the new CRUM number is valid for color and region, the printer writes 2 bytes (value A5) at 0x004A and 0x004B, to check if the eeprom has not been locked If 0x004A and 0x004B are both A5, the printer sets its internal counter for PAGES and JOBS reading these data from the chip at 0x00C2-0x00C4 (PAGES), 0x00D4 (JOBS).

Note: PAGES seem to be crumbled and xored with some data like the CRUM number.

Finally the printer stores internally the new CRUM number Note: Point n.

I can say that this behaviour maybe depends from the software inside the printer, since from the tests performed with my printer, exchanging toner never increased the number of pages for that particular cartridge.

The following image shows the bytes that are changed over time: When the toner finishes the process is the following one: Array 0x0080 - 0x00F0 is moved to 0x0000 - 0x0070 0x004A is turned into AA Permanent ( software) write protection is turned on As its possible to see, this lock protection has several flaws: No encryption is used Validation is performed by writing the same values at always the same locations Printer doest check if the writing operations on the chip were succesfully accomplished Now the steps that we should perform to have a fully permant chips are quite clear: Our chip should have the value A5, A5 at ox004A ox004B The crum number, the color and the other information should be set correctly PAGES and JOBS should have the minimum value recognized as valid (i.e.

The whole array should be write protected, so the printer is not able to change PAGES, JOBS and to lock the cartridge with AA at 0x004A.

Lets build our Permanent Chip The following image represent the dump I used on my Black permanent reset chip for EUR region.

Of course for different colours, the byte at 0x009B and 0x009E should change.

Now that we have the correct dump, we can transfer it on the chip using our home made I2C serial programmer.

If you have any doubt on how to perform this operation, please read FixYourOwnPrinter thread before going any further.

As specified on the Atmel documentation for 34c02 here, in addition to the Software Write Protection, we have the Hardware Write protection: The WP pin can be connected to VCC, GND, or left floating.

Reset Chip Fix Generator Samsung Clp 325 Printer